X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/2767fc02919545bd65082b4682b2331def9a5ad5..refs/pull/165/head:/client/cmddata.c

diff --git a/client/cmddata.c b/client/cmddata.c
index e2e2ca6d..900cfc83 100644
--- a/client/cmddata.c
+++ b/client/cmddata.c
@@ -23,10 +23,12 @@
 #include "lfdemod.h"
 #include "usb_cmd.h"
 #include "crc.h"
+#include "crc16.h"
+#include "loclass/cipherutils.h"
 
 uint8_t DemodBuffer[MAX_DEMOD_BUF_LEN];
-uint8_t g_debugMode;
-int DemodBufferLen;
+uint8_t g_debugMode=0;
+size_t DemodBufferLen=0;
 static int CmdHelp(const char *Cmd);
 
 //set the demod buffer with given array of binary (one bit per byte)
@@ -55,6 +57,16 @@ int CmdSetDebugMode(const char *Cmd)
 	return 1;
 }
 
+int usage_data_printdemodbuf(){
+		PrintAndLog("Usage: data printdemodbuffer x o <offset> l <length>");
+		PrintAndLog("Options:        ");
+		PrintAndLog("       h          This help");
+		PrintAndLog("       x          output in hex (omit for binary output)");
+		PrintAndLog("       o <offset> enter offset in # of bits");
+		PrintAndLog("       l <length> enter length to print in # of bits or hex characters respectively");
+		return 0;	
+}
+
 //by marshmellow
 void printDemodBuff(void)
 {
@@ -73,23 +85,56 @@ void printDemodBuff(void)
 
 int CmdPrintDemodBuff(const char *Cmd)
 {
-	char hex;
-	char printBuff[512]={0x00};
-	uint8_t numBits = DemodBufferLen & 0xFFFC;
-	sscanf(Cmd, "%c", &hex);
-	if (hex == 'h'){
-		PrintAndLog("Usage: data printdemodbuffer [x]");
-		PrintAndLog("Options:        ");
-		PrintAndLog("       h       This help");
-		PrintAndLog("       x       output in hex (omit for binary output)");
-		return 0;
+	char hex[512]={0x00};
+	bool hexMode = false;
+	bool errors = false;
+	uint32_t offset = 0; //could be size_t but no param_get16...
+	uint32_t length = 512;
+	char cmdp = 0;
+	while(param_getchar(Cmd, cmdp) != 0x00)
+	{
+		switch(param_getchar(Cmd, cmdp))
+		{
+		case 'h':
+		case 'H':
+			return usage_data_printdemodbuf();
+		case 'x':
+		case 'X':
+			hexMode = true;
+			cmdp++;
+			break;
+		case 'o':
+		case 'O':
+			offset = param_get32ex(Cmd, cmdp+1, 0, 10);
+			if (!offset) errors = true;
+			cmdp += 2;
+			break;
+		case 'l':
+		case 'L':
+			length = param_get32ex(Cmd, cmdp+1, 512, 10);
+			if (!length) errors = true;
+			cmdp += 2;
+			break;
+		default:
+			PrintAndLog("Unknown parameter '%c'", param_getchar(Cmd, cmdp));
+			errors = true;
+			break;
+		}
+		if(errors) break;
 	}
-	if (hex == 'x'){
-		numBits = binarraytohex(printBuff, (char *)DemodBuffer, numBits);
+	//Validations
+	if(errors) return usage_data_printdemodbuf();
+	length = (length > (DemodBufferLen-offset)) ? DemodBufferLen-offset : length; 
+	int numBits = (length) & 0x00FFC; //make sure we don't exceed our string
+
+	if (hexMode){
+		char *buf = (char *) (DemodBuffer + offset);
+		numBits = (numBits > sizeof(hex)) ? sizeof(hex) : numBits;
+		numBits = binarraytohex(hex, buf, numBits);
 		if (numBits==0) return 0;
-		PrintAndLog("DemodBuffer: %s",printBuff);
+		PrintAndLog("DemodBuffer: %s",hex);		
 	} else {
-		printDemodBuff();
+		PrintAndLog("DemodBuffer:\n%s", sprint_bin_break(DemodBuffer+offset,numBits,16));
 	}
 	return 1;
 }
@@ -208,22 +253,34 @@ void printEM410x(uint32_t hi, uint64_t id)
 	return;
 }
 
-
-int AskEm410xDemod(const char *Cmd, uint32_t *hi, uint64_t *lo)
+int AskEm410xDecode(bool verbose, uint32_t *hi, uint64_t *lo )
 {
-	int ans = ASKmanDemod(Cmd, FALSE, FALSE);
-	if (!ans) return 0;
-
-	size_t idx=0;
-	if (Em410xDecode(DemodBuffer,(size_t *) &DemodBufferLen, &idx, hi, lo)){
+	size_t idx = 0;
+	size_t BitLen = DemodBufferLen;
+	uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
+	memcpy(BitStream, DemodBuffer, BitLen); 
+	if (Em410xDecode(BitStream, &BitLen, &idx, hi, lo)){
+		//set GraphBuffer for clone or sim command
+		setDemodBuf(BitStream, BitLen, idx);
 		if (g_debugMode){
-			PrintAndLog("DEBUG: idx: %d, Len: %d, Printing Demod Buffer:", idx, DemodBufferLen);
+			PrintAndLog("DEBUG: idx: %d, Len: %d, Printing Demod Buffer:", idx, BitLen);
 			printDemodBuff();
 		}
+		if (verbose){
+			PrintAndLog("EM410x pattern found: ");
+			printEM410x(*hi, *lo);
+		}
 		return 1;
 	}
 	return 0;
 }
+
+int AskEm410xDemod(const char *Cmd, uint32_t *hi, uint64_t *lo, bool verbose)
+{
+	if (!ASKDemod(Cmd, FALSE, FALSE, 1)) return 0;
+	return AskEm410xDecode(verbose, hi, lo);
+}
+
 //by marshmellow
 //takes 3 arguments - clock, invert and maxErr as integers
 //attempts to demodulate ask while decoding manchester
@@ -244,28 +301,28 @@ int CmdAskEM410xDemod(const char *Cmd)
 		PrintAndLog("          : data askem410xdemod 64 1 0 = demod an EM410x Tag ID from GraphBuffer using a clock of RF/64 and inverting data and allowing 0 demod errors");
 		return 0;
 	}
-	uint32_t hi = 0;
 	uint64_t lo = 0;
-	if (AskEm410xDemod(Cmd, &hi, &lo)) {
-		PrintAndLog("EM410x pattern found: ");
-		printEM410x(hi, lo);
-		return 1;
-	}
-	return 0;
+	uint32_t hi = 0;
+	return AskEm410xDemod(Cmd, &hi, &lo, true);
 }
 
-int ASKmanDemod(const char *Cmd, bool verbose, bool emSearch)
+//by marshmellow
+//Cmd Args: Clock, invert, maxErr, maxLen as integers and amplify as char == 'a'
+//   (amp may not be needed anymore)
+//verbose will print results and demoding messages
+//emSearch will auto search for EM410x format in bitstream
+//askType switches decode: ask/raw = 0, ask/manchester = 1 
+int ASKDemod(const char *Cmd, bool verbose, bool emSearch, uint8_t askType)
 {
 	int invert=0;
 	int clk=0;
 	int maxErr=100;
-	int maxLen=512*64;
-	//param_getdec(Cmd, 0, &clk);
-	//param_getdec(Cmd, 1, &invert);
-	//maxErr = param_get32ex(Cmd, 2, 0xFFFFFFFF, 10);
-	//if (maxErr == 0xFFFFFFFF) maxErr=100;
+	int maxLen=0;
+	uint8_t askAmp = 0;
+	char amp = param_getchar(Cmd, 0);
 	uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
-	sscanf(Cmd, "%i %i %i %i", &clk, &invert, &maxErr, &maxLen);
+	sscanf(Cmd, "%i %i %i %i %c", &clk, &invert, &maxErr, &maxLen, &amp);
+	if (!maxLen) maxLen = BIGBUF_SIZE;
 	if (invert != 0 && invert != 1) {
 		PrintAndLog("Invalid argument: %s", Cmd);
 		return 0;
@@ -274,12 +331,14 @@ int ASKmanDemod(const char *Cmd, bool verbose, bool emSearch)
 		invert=1;
 		clk=0;
 	}
+	if (amp == 'a' || amp == 'A') askAmp=1; 
 	size_t BitLen = getFromGraphBuf(BitStream);
 	if (g_debugMode) PrintAndLog("DEBUG: Bitlen from grphbuff: %d",BitLen);
-	if (!BitLen) return 0;
+	if (BitLen<255) return 0;
 	if (maxLen<BitLen && maxLen != 0) BitLen = maxLen;
-	int errCnt = askmandemod(BitStream, &BitLen, &clk, &invert, maxErr);
-	if (errCnt<0||BitLen<16){  //if fatal error (or -1)
+
+	int errCnt = askdemod(BitStream, &BitLen, &clk, &invert, maxErr, askAmp, askType);
+	if (errCnt<0 || BitLen<16){  //if fatal error (or -1)
 		if (g_debugMode) PrintAndLog("DEBUG: no data found %d, errors:%d, bitlen:%d, clock:%d",errCnt,invert,BitLen,clk);
 		return 0;
 	}
@@ -290,45 +349,37 @@ int ASKmanDemod(const char *Cmd, bool verbose, bool emSearch)
 	if (verbose || g_debugMode) PrintAndLog("\nUsing Clock:%d, Invert:%d, Bits Found:%d",clk,invert,BitLen);
 
 	//output
-	if (errCnt>0){
-		if (verbose || g_debugMode) PrintAndLog("# Errors during Demoding (shown as 7 in bit stream): %d",errCnt);
-	}
-	if (verbose || g_debugMode) PrintAndLog("ASK/Manchester decoded bitstream:");
-	// Now output the bitstream to the scrollback by line of 16 bits
 	setDemodBuf(BitStream,BitLen,0);
-	if (verbose || g_debugMode) printDemodBuff();
-	uint64_t lo =0;
-	uint32_t hi =0;
-	size_t idx=0;
+	if (verbose || g_debugMode){
+		if (errCnt>0) PrintAndLog("# Errors during Demoding (shown as 7 in bit stream): %d",errCnt);
+		if (askType) PrintAndLog("ASK/Manchester - Clock: %d - Decoded bitstream:",clk);
+		else PrintAndLog("ASK/Raw - Clock: %d - Decoded bitstream:",clk);
+		// Now output the bitstream to the scrollback by line of 16 bits
+		printDemodBuff();
+		
+	}
+	uint64_t lo = 0;
+	uint32_t hi = 0;
 	if (emSearch){
-		if (Em410xDecode(BitStream, &BitLen, &idx, &hi, &lo)){
-			//set GraphBuffer for clone or sim command
-			setDemodBuf(BitStream, BitLen, idx);
-			if (g_debugMode){
-				PrintAndLog("DEBUG: idx: %d, Len: %d, Printing Demod Buffer:", idx, BitLen);
-				printDemodBuff();
-			}
-			if (verbose) PrintAndLog("EM410x pattern found: ");
-			if (verbose) printEM410x(hi, lo);
-			return 1;
-		}
+		AskEm410xDecode(true, &hi, &lo);
 	}
 	return 1;
 }
 
 //by marshmellow
-//takes 3 arguments - clock, invert, maxErr as integers
+//takes 5 arguments - clock, invert, maxErr, maxLen as integers and amplify as char == 'a'
 //attempts to demodulate ask while decoding manchester
 //prints binary found and saves in graphbuffer for further commands
 int Cmdaskmandemod(const char *Cmd)
 {
 	char cmdp = param_getchar(Cmd, 0);
-	if (strlen(Cmd) > 20 || cmdp == 'h' || cmdp == 'H') {
-		PrintAndLog("Usage:  data rawdemod am [clock] <0|1> [maxError] [setSmplLen]");
-		PrintAndLog("     [set clock as integer] optional, if not set, autodetect.");
-		PrintAndLog("     <invert>, 1 for invert output");
-		PrintAndLog("     [set maximum allowed errors], default = 100.");
-		PrintAndLog("     [set maximum Samples to read], default = 32768 (512 bits at rf/64).");
+	if (strlen(Cmd) > 25 || cmdp == 'h' || cmdp == 'H') {
+		PrintAndLog("Usage:  data rawdemod am [clock] <invert> [maxError] [maxLen] [amplify]");
+		PrintAndLog("     [set clock as integer] optional, if not set, autodetect");
+		PrintAndLog("     <invert>, 1 to invert output");
+		PrintAndLog("     [set maximum allowed errors], default = 100");
+		PrintAndLog("     [set maximum Samples to read], default = 32768 (512 bits at rf/64)");
+		PrintAndLog("     <amplify>, 'a' to attempt demod with ask amplification, default = no amp");
 		PrintAndLog("");
 		PrintAndLog("    sample: data rawdemod am        = demod an ask/manchester tag from GraphBuffer");
 		PrintAndLog("          : data rawdemod am 32     = demod an ask/manchester tag from GraphBuffer using a clock of RF/32");
@@ -337,7 +388,7 @@ int Cmdaskmandemod(const char *Cmd)
 		PrintAndLog("          : data rawdemod am 64 1 0 = demod an ask/manchester tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors");
 		return 0;
 	}
-	return ASKmanDemod(Cmd, TRUE, TRUE);
+	return ASKDemod(Cmd, TRUE, TRUE, 1);
 }
 
 //by marshmellow
@@ -348,12 +399,15 @@ int Cmdmandecoderaw(const char *Cmd)
 	int i =0;
 	int errCnt=0;
 	size_t size=0;
-	size_t maxErr = 20;
+	int invert=0;
+	int maxErr = 20;
 	char cmdp = param_getchar(Cmd, 0);
-	if (strlen(Cmd) > 1 || cmdp == 'h' || cmdp == 'H') {
-		PrintAndLog("Usage:  data manrawdecode");
+	if (strlen(Cmd) > 5 || cmdp == 'h' || cmdp == 'H') {
+		PrintAndLog("Usage:  data manrawdecode [invert] [maxErr]");
 		PrintAndLog("     Takes 10 and 01 and converts to 0 and 1 respectively");
 		PrintAndLog("     --must have binary sequence in demodbuffer (run data askrawdemod first)");
+		PrintAndLog("  [invert]  invert output");		
+		PrintAndLog("  [maxErr]  set number of errors allowed (default = 20)");		
 		PrintAndLog("");
 		PrintAndLog("    sample: data manrawdecode   = decode manchester bitstream from the demodbuffer");
 		return 0;
@@ -366,12 +420,14 @@ int Cmdmandecoderaw(const char *Cmd)
 		else if(DemodBuffer[i]<low) low=DemodBuffer[i];
 		BitStream[i]=DemodBuffer[i];
 	}
-	if (high>1 || low <0 ){
+	if (high>7 || low <0 ){
 		PrintAndLog("Error: please raw demod the wave first then manchester raw decode");
 		return 0;
 	}
+
+	sscanf(Cmd, "%i %i", &invert, &maxErr);
 	size=i;
-	errCnt=manrawdecode(BitStream, &size);
+	errCnt=manrawdecode(BitStream, &size, invert);
 	if (errCnt>=maxErr){
 		PrintAndLog("Too many errors: %d",errCnt);
 		return 0;
@@ -445,81 +501,25 @@ int CmdBiphaseDecodeRaw(const char *Cmd)
 	return 1;
 }
 
-//by marshmellow
-//takes 4 arguments - clock, invert, maxErr as integers and amplify as char
-//attempts to demodulate ask only
-//prints binary found and saves in graphbuffer for further commands
-int ASKrawDemod(const char *Cmd, bool verbose)
-{
-	int invert=0;
-	int clk=0;
-	int maxErr=100;
-	uint8_t askAmp = 0;
-	char amp = param_getchar(Cmd, 0);
-	uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
-	sscanf(Cmd, "%i %i %i %c", &clk, &invert, &maxErr, &amp);
-	if (invert != 0 && invert != 1) {
-		if (verbose || g_debugMode) PrintAndLog("Invalid argument: %s", Cmd);
-		return 0;
-	}
-	if (clk==1){
-		invert=1;
-		clk=0;
-	}
-	if (amp == 'a' || amp == 'A') askAmp=1; 
-	size_t BitLen = getFromGraphBuf(BitStream);
-	if (BitLen==0) return 0;
-	int errCnt = askrawdemod(BitStream, &BitLen, &clk, &invert, maxErr, askAmp);
-	if (errCnt==-1||BitLen<16){  //throw away static - allow 1 and -1 (in case of threshold command first)
-		if (verbose || g_debugMode) PrintAndLog("no data found");
-		if (g_debugMode) PrintAndLog("errCnt: %d, BitLen: %d, clk: %d, invert: %d", errCnt, BitLen, clk, invert);
-		return 0;
-	}
-	if (errCnt>maxErr) {
-		if (g_debugMode) 
-			PrintAndLog("Too many errors found, errCnt: %d, BitLen: %d, clk: %d, invert: %d", errCnt, BitLen, clk, invert);
-		return 0;
-	}
-	if (verbose || g_debugMode) 
-		PrintAndLog("Using Clock: %d - invert: %d - Bits Found: %d", clk, invert, BitLen);
-	
-	//move BitStream back to DemodBuffer
-	setDemodBuf(BitStream,BitLen,0);
-
-	//output
-	if (errCnt>0 && (verbose || g_debugMode)){
-		PrintAndLog("# Errors during Demoding (shown as 7 in bit stream): %d", errCnt);
-	}
-	if (verbose || g_debugMode){
-		PrintAndLog("ASK demoded bitstream:");
-		// Now output the bitstream to the scrollback by line of 16 bits
-		printDemodBuff();
-	} 
-	return 1;
-}
-
 //by marshmellow
 // - ASK Demod then Biphase decode GraphBuffer samples
 int ASKbiphaseDemod(const char *Cmd, bool verbose)
 {
 	//ask raw demod GraphBuffer first
-	int offset=0, clk=0, invert=0, maxErr=0, ans=0;
-	ans = sscanf(Cmd, "%i %i %i %i", &offset, &clk, &invert, &maxErr);
-	if (ans>0)
-		ans = ASKrawDemod(Cmd+1, FALSE);
-	else
-		ans = ASKrawDemod(Cmd, FALSE);
-	if (!ans) {
-		if (g_debugMode || verbose) PrintAndLog("Error AskrawDemod: %d", ans);
-		return 0;
-	}
-
-	//attempt to Biphase decode DemodBuffer
-	size_t size = DemodBufferLen;
-	uint8_t BitStream[MAX_DEMOD_BUF_LEN];
-	memcpy(BitStream, DemodBuffer, DemodBufferLen); 
+	int offset=0, clk=0, invert=0, maxErr=0;
+	sscanf(Cmd, "%i %i %i %i", &offset, &clk, &invert, &maxErr);
+
+	uint8_t BitStream[MAX_DEMOD_BUF_LEN];	  
+	size_t size = getFromGraphBuf(BitStream);	  
+	//invert here inverts the ask raw demoded bits which has no effect on the demod, but we need the pointer
+	int errCnt = askdemod(BitStream, &size, &clk, &invert, maxErr, 0, 0);  
+	if ( errCnt < 0 || errCnt > maxErr ) {   
+		if (g_debugMode) PrintAndLog("DEBUG: no data or error found %d, clock: %d", errCnt, clk);  
+			return 0;  
+	} 
 
-	int errCnt = BiphaseRawDecode(BitStream, &size, offset, invert);
+	//attempt to Biphase decode BitStream
+	errCnt = BiphaseRawDecode(BitStream, &size, offset, invert);
 	if (errCnt < 0){
 		if (g_debugMode || verbose) PrintAndLog("Error BiphaseRawDecode: %d", errCnt);
 		return 0;
@@ -531,7 +531,7 @@ int ASKbiphaseDemod(const char *Cmd, bool verbose)
 	//success set DemodBuffer and return
 	setDemodBuf(BitStream, size, 0);
 	if (g_debugMode || verbose){
-		PrintAndLog("Biphase Decoded using offset: %d - # errors:%d - data:",offset,errCnt);
+		PrintAndLog("Biphase Decoded using offset: %d - clock: %d - # errors:%d - data:",offset,clk,errCnt);
 		printDemodBuff();
 	}
 	return 1;
@@ -540,12 +540,13 @@ int ASKbiphaseDemod(const char *Cmd, bool verbose)
 int Cmdaskbiphdemod(const char *Cmd)
 {
 	char cmdp = param_getchar(Cmd, 0);
-	if (strlen(Cmd) > 12 || cmdp == 'h' || cmdp == 'H') {
-		PrintAndLog("Usage:  data rawdemod ab [offset] [clock] <invert> [maxError] <amplify>");
+	if (strlen(Cmd) > 25 || cmdp == 'h' || cmdp == 'H') {
+		PrintAndLog("Usage:  data rawdemod ab [offset] [clock] <invert> [maxError] [maxLen] <amplify>");
 		PrintAndLog("     [offset], offset to begin biphase, default=0");
 		PrintAndLog("     [set clock as integer] optional, if not set, autodetect");
 		PrintAndLog("     <invert>, 1 to invert output");
 		PrintAndLog("     [set maximum allowed errors], default = 100");
+		PrintAndLog("     [set maximum Samples to read], default = 32768 (512 bits at rf/64)");
 		PrintAndLog("     <amplify>, 'a' to attempt demod with ask amplification, default = no amp");
 		PrintAndLog("     NOTE: <invert>  can be entered as second or third argument");
 		PrintAndLog("     NOTE: <amplify> can be entered as first, second or last argument");
@@ -553,13 +554,13 @@ int Cmdaskbiphdemod(const char *Cmd)
 		PrintAndLog("");
 		PrintAndLog("     NOTE: --invert for Conditional Dephase Encoding (CDP) AKA Differential Manchester");
 		PrintAndLog("");
-		PrintAndLog("    sample: data rawdemod ab            = demod an ask/biph tag from GraphBuffer");
-		PrintAndLog("          : data rawdemod ab a          = demod an ask/biph tag from GraphBuffer, amplified");
-		PrintAndLog("          : data rawdemod ab 1 32       = demod an ask/biph tag from GraphBuffer using an offset of 1 and a clock of RF/32");
-		PrintAndLog("          : data rawdemod ab 0 32 1     = demod an ask/biph tag from GraphBuffer using a clock of RF/32 and inverting data");
-		PrintAndLog("          : data rawdemod ab 0 1        = demod an ask/biph tag from GraphBuffer while inverting data");
-		PrintAndLog("          : data rawdemod ab 0 64 1 0   = demod an ask/biph tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors");
-		PrintAndLog("          : data rawdemod ab 0 64 1 0 a = demod an ask/biph tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors, and amp");
+		PrintAndLog("    sample: data rawdemod ab              = demod an ask/biph tag from GraphBuffer");
+		PrintAndLog("          : data rawdemod ab 0 a          = demod an ask/biph tag from GraphBuffer, amplified");
+		PrintAndLog("          : data rawdemod ab 1 32         = demod an ask/biph tag from GraphBuffer using an offset of 1 and a clock of RF/32");
+		PrintAndLog("          : data rawdemod ab 0 32 1       = demod an ask/biph tag from GraphBuffer using a clock of RF/32 and inverting data");
+		PrintAndLog("          : data rawdemod ab 0 1          = demod an ask/biph tag from GraphBuffer while inverting data");
+		PrintAndLog("          : data rawdemod ab 0 64 1 0     = demod an ask/biph tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors");
+		PrintAndLog("          : data rawdemod ab 0 64 1 0 0 a = demod an ask/biph tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors, and amp");
 		return 0;
 	}
 	return ASKbiphaseDemod(Cmd, TRUE);
@@ -643,27 +644,54 @@ int CmdG_Prox_II_Demod(const char *Cmd)
 	return 1;
 }
 
-//by marshmellow - see ASKrawDemod
+//by marshmellow
+//see ASKDemod for what args are accepted
+int CmdVikingDemod(const char *Cmd)
+{
+	if (!ASKDemod(Cmd, false, false, 1)) {
+		if (g_debugMode) PrintAndLog("ASKDemod failed");
+		return 0;
+	}
+	size_t size = DemodBufferLen;
+	//call lfdemod.c demod for Viking
+	int ans = VikingDemod_AM(DemodBuffer, &size);
+	if (ans < 0) {
+		if (g_debugMode) PrintAndLog("Error Viking_Demod %d", ans);
+		return 0;
+	}
+	//got a good demod
+	uint32_t raw1 = bytebits_to_byte(DemodBuffer+ans, 32);
+	uint32_t raw2 = bytebits_to_byte(DemodBuffer+ans+32, 32);
+	uint32_t cardid = bytebits_to_byte(DemodBuffer+ans+24, 32);
+	uint8_t  checksum = bytebits_to_byte(DemodBuffer+ans+32+24, 8);
+	PrintAndLog("Viking Tag Found: Card ID %08X, Checksum: %02X", cardid, checksum);
+	PrintAndLog("Raw: %08X%08X", raw1,raw2);
+	setDemodBuf(DemodBuffer+ans, 64, 0);
+	return 1;
+}
+
+//by marshmellow - see ASKDemod
 int Cmdaskrawdemod(const char *Cmd)
 {
 	char cmdp = param_getchar(Cmd, 0);
-	if (strlen(Cmd) > 12 || cmdp == 'h' || cmdp == 'H') {
-		PrintAndLog("Usage:  data rawdemod ar [clock] <invert> [maxError] [amplify]");
+	if (strlen(Cmd) > 25 || cmdp == 'h' || cmdp == 'H') {
+		PrintAndLog("Usage:  data rawdemod ar [clock] <invert> [maxError] [maxLen] [amplify]");
 		PrintAndLog("     [set clock as integer] optional, if not set, autodetect");
 		PrintAndLog("     <invert>, 1 to invert output");
 		PrintAndLog("     [set maximum allowed errors], default = 100");
+		PrintAndLog("     [set maximum Samples to read], default = 32768 (1024 bits at rf/64)");
 		PrintAndLog("     <amplify>, 'a' to attempt demod with ask amplification, default = no amp");
 		PrintAndLog("");
-		PrintAndLog("    sample: data rawdemod ar          = demod an ask tag from GraphBuffer");
-		PrintAndLog("          : data rawdemod ar a        = demod an ask tag from GraphBuffer, amplified");
-		PrintAndLog("          : data rawdemod ar 32       = demod an ask tag from GraphBuffer using a clock of RF/32");
-		PrintAndLog("          : data rawdemod ar 32 1     = demod an ask tag from GraphBuffer using a clock of RF/32 and inverting data");
-		PrintAndLog("          : data rawdemod ar 1        = demod an ask tag from GraphBuffer while inverting data");
-		PrintAndLog("          : data rawdemod ar 64 1 0   = demod an ask tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors");
-		PrintAndLog("          : data rawdemod ar 64 1 0 a = demod an ask tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors, and amp");
+		PrintAndLog("    sample: data rawdemod ar            = demod an ask tag from GraphBuffer");
+		PrintAndLog("          : data rawdemod ar a          = demod an ask tag from GraphBuffer, amplified");
+		PrintAndLog("          : data rawdemod ar 32         = demod an ask tag from GraphBuffer using a clock of RF/32");
+		PrintAndLog("          : data rawdemod ar 32 1       = demod an ask tag from GraphBuffer using a clock of RF/32 and inverting data");
+		PrintAndLog("          : data rawdemod ar 1          = demod an ask tag from GraphBuffer while inverting data");
+		PrintAndLog("          : data rawdemod ar 64 1 0     = demod an ask tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors");
+		PrintAndLog("          : data rawdemod ar 64 1 0 0 a = demod an ask tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors, and amp");
 		return 0;
 	}
-	return ASKrawDemod(Cmd, TRUE);
+	return ASKDemod(Cmd, TRUE, FALSE, 0);
 }
 
 int AutoCorrelate(int window, bool SaveGrph, bool verbose)
@@ -846,24 +874,14 @@ int CmdAskEdgeDetect(const char *Cmd)
 {
 	int thresLen = 25;
 	sscanf(Cmd, "%i", &thresLen); 
-	int shift = 127;
-	int shiftedVal=0;
+
 	for(int i = 1; i<GraphTraceLen; i++){
 		if (GraphBuffer[i]-GraphBuffer[i-1]>=thresLen) //large jump up
-			shift=127;
+			GraphBuffer[i-1] = 127;
 		else if(GraphBuffer[i]-GraphBuffer[i-1]<=-1*thresLen) //large jump down
-			shift=-127;
-
-		shiftedVal=GraphBuffer[i]+shift;
-
-		if (shiftedVal>127) 
-			shiftedVal=127;
-		else if (shiftedVal<-127) 
-			shiftedVal=-127;
-		GraphBuffer[i-1] = shiftedVal;
+			GraphBuffer[i-1] = -127;
 	}
 	RepaintGraphWindow();
-	//CmdNorm("");
 	return 0;
 }
 
@@ -873,9 +891,10 @@ int CmdAskEdgeDetect(const char *Cmd)
 int CmdDetectClockRate(const char *Cmd)
 {
 	char cmdp = param_getchar(Cmd, 0);
-	if (strlen(Cmd) > 3 || strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') {
-		PrintAndLog("Usage:  data detectclock [modulation]");
+	if (strlen(Cmd) > 6 || strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') {
+		PrintAndLog("Usage:  data detectclock [modulation] <clock>");
 		PrintAndLog("     [modulation as char], specify the modulation type you want to detect the clock of");
+		PrintAndLog("     <clock>             , specify the clock (optional - to get best start position only)");
 		PrintAndLog("       'a' = ask, 'f' = fsk, 'n' = nrz/direct, 'p' = psk");
 		PrintAndLog("");
 		PrintAndLog("    sample: data detectclock a    = detect the clock of an ask modulated wave in the GraphBuffer");
@@ -885,7 +904,7 @@ int CmdDetectClockRate(const char *Cmd)
 	}
 	int ans=0;
 	if (cmdp == 'a'){
-		ans = GetAskClock("", true, false);
+		ans = GetAskClock(Cmd+1, true, false);
 	} else if (cmdp == 'f'){
 		ans = GetFskClock("", true, false);
 	} else if (cmdp == 'n'){
@@ -900,19 +919,21 @@ int CmdDetectClockRate(const char *Cmd)
 
 char *GetFSKType(uint8_t fchigh, uint8_t fclow, uint8_t invert)
 {
-	char *fskType;
+	static char fType[8];
+	memset(fType, 0x00, 8);
+	char *fskType = fType;
 	if (fchigh==10 && fclow==8){
 		if (invert) //fsk2a
-			fskType = "FSK2a";
+			memcpy(fskType, "FSK2a", 5);
 		else //fsk2
-			fskType = "FSK2";
+			memcpy(fskType, "FSK2", 4);
 	} else if (fchigh == 8 && fclow == 5) {
 		if (invert)
-			fskType = "FSK1";
+			memcpy(fskType, "FSK1", 4);
 		else
-			fskType = "FSK1a";
+			memcpy(fskType, "FSK1a", 5);
 	} else {
-		fskType = "FSK??";
+		memcpy(fskType, "FSK??", 5);
 	}
 	return fskType;
 }
@@ -924,55 +945,52 @@ char *GetFSKType(uint8_t fchigh, uint8_t fclow, uint8_t invert)
 int FSKrawDemod(const char *Cmd, bool verbose)
 {
 	//raw fsk demod  no manchester decoding no start bit finding just get binary from wave
+	uint8_t rfLen, invert, fchigh, fclow;
 	//set defaults
-	int rfLen = 0;
-	int invert = 0;
-	int fchigh = 0;
-	int fclow = 0;
-
 	//set options from parameters entered with the command
-	sscanf(Cmd, "%i %i %i %i", &rfLen, &invert, &fchigh, &fclow);
-
+	rfLen = param_get8(Cmd, 0);
+	invert = param_get8(Cmd, 1);
+	fchigh = param_get8(Cmd, 2);
+	fclow = param_get8(Cmd, 3);
 	if (strlen(Cmd)>0 && strlen(Cmd)<=2) {
-		 if (rfLen==1){
+		if (rfLen==1) {
 			invert = 1;   //if invert option only is used
 			rfLen = 0;
-		 }
+		}
 	}
-
 	uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
 	size_t BitLen = getFromGraphBuf(BitStream);
 	if (BitLen==0) return 0;
+	if (g_debugMode==2) PrintAndLog("DEBUG: Got samples");	
 	//get field clock lengths
 	uint16_t fcs=0;
-	if (fchigh==0 || fclow == 0){
+	if (!fchigh || !fclow) {
 		fcs = countFC(BitStream, BitLen, 1);
-		if (fcs==0){
-			fchigh=10;
-			fclow=8;
-		}else{
-			fchigh = (fcs >> 8) & 0xFF;
-			fclow = fcs & 0xFF;
+		if (!fcs) {
+			fchigh = 10;
+			fclow = 8;
+		} else {
+			fchigh = (fcs >> 8) & 0x00FF;
+			fclow = fcs & 0x00FF;
 		}
 	}
 	//get bit clock length
-	if (rfLen==0){
+	if (!rfLen) {
 		rfLen = detectFSKClk(BitStream, BitLen, fchigh, fclow);
-		if (rfLen == 0) rfLen = 50;
+		if (!rfLen) rfLen = 50;
 	}
-	int size = fskdemod(BitStream,BitLen,(uint8_t)rfLen,(uint8_t)invert,(uint8_t)fchigh,(uint8_t)fclow);
-	if (size>0){
+	int size = fskdemod(BitStream, BitLen, rfLen, invert, fchigh, fclow);
+	if (size > 0) {
 		setDemodBuf(BitStream,size,0);
 
 		// Now output the bitstream to the scrollback by line of 16 bits
 		if (verbose || g_debugMode) {
-			PrintAndLog("\nUsing Clock:%d, invert:%d, fchigh:%d, fclow:%d", rfLen, invert, fchigh, fclow);
+			PrintAndLog("\nUsing Clock:%u, invert:%u, fchigh:%u, fclow:%u", (unsigned int)rfLen, (unsigned int)invert, (unsigned int)fchigh, (unsigned int)fclow);
 			PrintAndLog("%s decoded bitstream:",GetFSKType(fchigh,fclow,invert));
 			printDemodBuff();
 		}
-
 		return 1;
-	} else{
+	} else {
 		if (g_debugMode) PrintAndLog("no FSK data found");
 	}
 	return 0;
@@ -1144,8 +1162,6 @@ int CmdFSKdemodParadox(const char *Cmd)
 //print ioprox ID and some format details
 int CmdFSKdemodIO(const char *Cmd)
 {
-	//raw fsk demod no manchester decoding no start bit finding just get binary from wave
-	//set defaults
 	int idx=0;
 	//something in graphbuffer?
 	if (GraphTraceLen < 65) {
@@ -1234,11 +1250,6 @@ int CmdFSKdemodIO(const char *Cmd)
 //print full AWID Prox ID and some bit format details if found
 int CmdFSKdemodAWID(const char *Cmd)
 {
-
-	//int verbose=1;
-	//sscanf(Cmd, "%i", &verbose);
-
-	//raw fsk demod no manchester decoding no start bit finding just get binary from wave
 	uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
 	size_t size = getFromGraphBuf(BitStream);
 	if (size==0) return 0;
@@ -1437,7 +1448,6 @@ int CmdFSKdemodPyramid(const char *Cmd)
 	uint32_t fc = 0;
 	uint32_t cardnum = 0;
 	uint32_t code1 = 0;
-	//uint32_t code2 = 0;
 	if (fmtLen==26){
 		fc = bytebits_to_byte(BitStream+73, 8);
 		cardnum = bytebits_to_byte(BitStream+81, 16);
@@ -1471,6 +1481,98 @@ int CmdFSKdemodPyramid(const char *Cmd)
 	return 1;
 }
 
+// FDX-B ISO11784/85 demod  (aka animal tag)  BIPHASE, inverted, rf/32,  with preamble of 00000000001 (128bits)
+// 8 databits + 1 parity (1)
+// CIITT 16 chksum
+// NATIONAL CODE, ICAR database
+// COUNTRY CODE (ISO3166) or http://cms.abvma.ca/uploads/ManufacturersISOsandCountryCodes.pdf
+// FLAG (animal/non-animal)
+/*
+38 IDbits   
+10 country code 
+1 extra app bit
+14 reserved bits
+1 animal bit
+16 ccitt CRC chksum over 64bit ID CODE.
+24 appli bits.
+
+-- sample: 985121004515220  [ 37FF65B88EF94 ]
+*/
+int CmdFDXBdemodBI(const char *Cmd){
+
+	int invert = 1;
+	int clk = 32;		
+	int errCnt = 0;
+	int maxErr = 0;
+	uint8_t BitStream[MAX_DEMOD_BUF_LEN];	
+	size_t size = getFromGraphBuf(BitStream);	
+	
+	errCnt = askdemod(BitStream, &size, &clk, &invert, maxErr, 0, 0);
+	if ( errCnt < 0 || errCnt > maxErr ) { 
+		if (g_debugMode) PrintAndLog("DEBUG: no data or error found %d, clock: %d", errCnt, clk);
+		return 0;
+	}
+
+	errCnt = BiphaseRawDecode(BitStream, &size, maxErr, 1);
+	if (errCnt < 0 || errCnt > maxErr ) {
+		if (g_debugMode) PrintAndLog("Error BiphaseRawDecode: %d", errCnt);
+		return 0;
+	} 
+
+	int preambleIndex = FDXBdemodBI(BitStream, &size);
+	if (preambleIndex < 0){
+		if (g_debugMode) PrintAndLog("Error FDXBDemod , no startmarker found :: %d",preambleIndex);
+		return 0;
+	}
+	if (size != 128) {
+		if (g_debugMode) PrintAndLog("Error incorrect data length found");
+		return 0;
+	}
+
+	setDemodBuf(BitStream, 128, preambleIndex);
+
+	// remove marker bits (1's every 9th digit after preamble) (pType = 2)
+	size = removeParity(BitStream, preambleIndex + 11, 9, 2, 117);
+	if ( size != 104 ) {
+		if (g_debugMode) PrintAndLog("Error removeParity:: %d", size);
+		return 0;
+	}
+	if (g_debugMode) {
+		char *bin = sprint_bin_break(BitStream,size,16);
+		PrintAndLog("DEBUG BinStream:\n%s",bin);
+	}
+	PrintAndLog("\nFDX-B / ISO 11784/5 Animal Tag ID Found:");
+	if (g_debugMode) PrintAndLog("Start marker %d;   Size %d", preambleIndex, size);
+
+	//got a good demod
+	uint64_t NationalCode = ((uint64_t)(bytebits_to_byteLSBF(BitStream+32,6)) << 32) | bytebits_to_byteLSBF(BitStream,32);
+	uint32_t countryCode = bytebits_to_byteLSBF(BitStream+38,10);
+	uint8_t dataBlockBit = BitStream[48];
+	uint32_t reservedCode = bytebits_to_byteLSBF(BitStream+49,14);
+	uint8_t animalBit = BitStream[63];
+	uint32_t crc16 = bytebits_to_byteLSBF(BitStream+64,16);
+	uint32_t extended = bytebits_to_byteLSBF(BitStream+80,24);
+
+	uint64_t rawid = ((uint64_t)bytebits_to_byte(BitStream,32)<<32) | bytebits_to_byte(BitStream+32,32);
+	uint8_t raw[8];
+	num_to_bytes(rawid, 8, raw);
+
+	if (g_debugMode) PrintAndLog("Raw ID Hex: %s", sprint_hex(raw,8));
+
+	uint16_t calcCrc = crc16_ccitt_kermit(raw, 8);
+	PrintAndLog("Animal ID:     %04u-%012llu", countryCode, NationalCode);
+	PrintAndLog("National Code: %012llu", NationalCode);
+	PrintAndLog("CountryCode:   %04u", countryCode);
+	PrintAndLog("Extended Data: %s", dataBlockBit ? "True" : "False");
+	PrintAndLog("reserved Code: %u", reservedCode);
+	PrintAndLog("Animal Tag:    %s", animalBit ? "True" : "False");
+	PrintAndLog("CRC:           0x%04X - [%04X] - %s", crc16, calcCrc, (calcCrc == crc16) ? "Passed" : "Failed");
+	PrintAndLog("Extended:      0x%X\n", extended);
+	
+	return 1;
+}
+
+
 //by marshmellow
 //attempt to psk1 demod graph buffer
 int PSKDemod(const char *Cmd, bool verbose)
@@ -1484,17 +1586,20 @@ int PSKDemod(const char *Cmd, bool verbose)
 		clk=0;
 	}
 	if (invert != 0 && invert != 1) {
-		if (verbose) PrintAndLog("Invalid argument: %s", Cmd);
+		if (g_debugMode || verbose) PrintAndLog("Invalid argument: %s", Cmd);
 		return 0;
 	}
 	uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
 	size_t BitLen = getFromGraphBuf(BitStream);
-	if (BitLen==0) return -1;
+	if (BitLen==0) return 0;
 	uint8_t carrier=countFC(BitStream, BitLen, 0);
 	if (carrier!=2 && carrier!=4 && carrier!=8){
 		//invalid carrier
 		return 0;
 	}
+	if (g_debugMode){
+		PrintAndLog("Carrier: rf/%d",carrier);
+	}
 	int errCnt=0;
 	errCnt = pskRawDemod(BitStream, &BitLen, &clk, &invert);
 	if (errCnt > maxErr){
@@ -1534,61 +1639,33 @@ int CmdIndalaDecode(const char *Cmd)
 		return 0;
 	}
 	uint8_t invert=0;
-	ans = indala26decode(DemodBuffer,(size_t *) &DemodBufferLen, &invert);
-	if (ans < 1) {
+	size_t size = DemodBufferLen;
+	size_t startIdx = indala26decode(DemodBuffer, &size, &invert);
+	if (startIdx < 1 || size > 224) {
 		if (g_debugMode==1)
 			PrintAndLog("Error2: %d",ans);
 		return -1;
 	}
-	char showbits[251]={0x00};
+	setDemodBuf(DemodBuffer, size, startIdx);
 	if (invert)
 		if (g_debugMode==1)
 			PrintAndLog("Had to invert bits");
 
+	PrintAndLog("BitLen: %d",DemodBufferLen);
 	//convert UID to HEX
 	uint32_t uid1, uid2, uid3, uid4, uid5, uid6, uid7;
-	int idx;
-	uid1=0;
-	uid2=0;
-	PrintAndLog("BitLen: %d",DemodBufferLen);
-	if (DemodBufferLen==64){
-		for( idx=0; idx<64; idx++) {
-			uid1=(uid1<<1)|(uid2>>31);
-			if (DemodBuffer[idx] == 0) {
-				uid2=(uid2<<1)|0;
-				showbits[idx]='0';
-			} else {
-				uid2=(uid2<<1)|1;
-				showbits[idx]='1';
-			}
-		}
-		showbits[idx]='\0';
-		PrintAndLog("Indala UID=%s (%x%08x)", showbits, uid1, uid2);
-	}
-	else {
-		uid3=0;
-		uid4=0;
-		uid5=0;
-		uid6=0;
-		uid7=0;
-		for( idx=0; idx<DemodBufferLen; idx++) {
-			uid1=(uid1<<1)|(uid2>>31);
-			uid2=(uid2<<1)|(uid3>>31);
-			uid3=(uid3<<1)|(uid4>>31);
-			uid4=(uid4<<1)|(uid5>>31);
-			uid5=(uid5<<1)|(uid6>>31);
-			uid6=(uid6<<1)|(uid7>>31);
-			if (DemodBuffer[idx] == 0) {
-				uid7=(uid7<<1)|0;
-				showbits[idx]='0';
-			}
-			else {
-				uid7=(uid7<<1)|1;
-				showbits[idx]='1';
-			}
-		}
-		showbits[idx]='\0';
-		PrintAndLog("Indala UID=%s (%x%08x%08x%08x%08x%08x%08x)", showbits, uid1, uid2, uid3, uid4, uid5, uid6, uid7);
+	uid1=bytebits_to_byte(DemodBuffer,32);
+	uid2=bytebits_to_byte(DemodBuffer+32,32);
+	if (DemodBufferLen==64) {
+		PrintAndLog("Indala UID=%s (%x%08x)", sprint_bin_break(DemodBuffer,DemodBufferLen,16), uid1, uid2);
+	} else {
+		uid3=bytebits_to_byte(DemodBuffer+64,32);
+		uid4=bytebits_to_byte(DemodBuffer+96,32);
+		uid5=bytebits_to_byte(DemodBuffer+128,32);
+		uid6=bytebits_to_byte(DemodBuffer+160,32);
+		uid7=bytebits_to_byte(DemodBuffer+192,32);
+		PrintAndLog("Indala UID=%s (%x%08x%08x%08x%08x%08x%08x)", 
+		    sprint_bin_break(DemodBuffer,DemodBufferLen,16), uid1, uid2, uid3, uid4, uid5, uid6, uid7);
 	}
 	if (g_debugMode){
 		PrintAndLog("DEBUG: printing demodbuffer:");
@@ -1597,11 +1674,49 @@ int CmdIndalaDecode(const char *Cmd)
 	return 1;
 }
 
+int CmdPSKNexWatch(const char *Cmd)
+{
+	if (!PSKDemod("", false)) return 0;
+	uint8_t preamble[28] = {0,0,0,0,0,1,0,1,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
+	size_t startIdx = 0, size = DemodBufferLen; 
+	bool invert = false;
+	if (!preambleSearch(DemodBuffer, preamble, sizeof(preamble), &size, &startIdx)){
+		// if didn't find preamble try again inverting
+		if (!PSKDemod("1", false)) return 0; 
+		size = DemodBufferLen;
+		if (!preambleSearch(DemodBuffer, preamble, sizeof(preamble), &size, &startIdx)) return 0;
+		invert = true;
+	} 
+	if (size != 128) return 0;
+	setDemodBuf(DemodBuffer, size, startIdx+4);
+	startIdx = 8+32; //4 = extra i added, 8 = preamble, 32 = reserved bits (always 0)
+	//get ID
+	uint32_t ID = 0;
+	for (uint8_t wordIdx=0; wordIdx<4; wordIdx++){
+		for (uint8_t idx=0; idx<8; idx++){
+			ID = (ID << 1) | DemodBuffer[startIdx+wordIdx+(idx*4)];
+		}	
+	}
+	//parity check (TBD)
+
+	//checksum check (TBD)
+
+	//output
+	PrintAndLog("NexWatch ID: %d", ID);
+	if (invert){
+		PrintAndLog("Had to Invert - probably NexKey");
+		for (uint8_t idx=0; idx<size; idx++)
+			DemodBuffer[idx] ^= 1;
+	} 
+
+	CmdPrintDemodBuff("x");
+	return 1;
+}
+
 // by marshmellow
 // takes 3 arguments - clock, invert, maxErr as integers
 // attempts to demodulate nrz only
 // prints binary found and saves in demodbuffer for further commands
-
 int NRZrawDemod(const char *Cmd, bool verbose)
 {
 	int invert=0;
@@ -1620,7 +1735,7 @@ int NRZrawDemod(const char *Cmd, bool verbose)
 	size_t BitLen = getFromGraphBuf(BitStream);
 	if (BitLen==0) return 0;
 	int errCnt=0;
-	errCnt = nrzRawDemod(BitStream, &BitLen, &clk, &invert, maxErr);
+	errCnt = nrzRawDemod(BitStream, &BitLen, &clk, &invert);
 	if (errCnt > maxErr){
 		if (g_debugMode) PrintAndLog("Too many errors found, clk: %d, invert: %d, numbits: %d, errCnt: %d",clk,invert,BitLen,errCnt);
 		return 0;
@@ -1843,26 +1958,14 @@ int CmdHpf(const char *Cmd)
 	RepaintGraphWindow();
 	return 0;
 }
-typedef struct {
-	uint8_t * buffer;
-	uint32_t numbits;
-	uint32_t position;
-}BitstreamOut;
 
-bool _headBit( BitstreamOut *stream)
-{
-	int bytepos = stream->position >> 3; // divide by 8
-	int bitpos = (stream->position++) & 7; // mask out 00000111
-	return (*(stream->buffer + bytepos) >> (7-bitpos)) & 1;
-}
-
-uint8_t getByte(uint8_t bits_per_sample, BitstreamOut* b)
+uint8_t getByte(uint8_t bits_per_sample, BitstreamIn* b)
 {
 	int i;
 	uint8_t val = 0;
 	for(i =0 ; i < bits_per_sample; i++)
 	{
-		val |= (_headBit(b) << (7-i));
+		val |= (headBit(b) << (7-i));
 	}
 	return val;
 }
@@ -1878,10 +1981,7 @@ int getSamples(const char *Cmd, bool silent)
 
 	int n = strtol(Cmd, NULL, 0);
 
-	if (n == 0)
-		n = sizeof(got);
-
-	if (n > sizeof(got))
+	if (n == 0 || n > sizeof(got))
 		n = sizeof(got);
 
 	PrintAndLog("Reading %d bytes from device memory\n", n);
@@ -1902,9 +2002,9 @@ int getSamples(const char *Cmd, bool silent)
 	if(bits_per_sample < 8)
 	{
 		PrintAndLog("Unpacking...");
-		BitstreamOut bout = { got, bits_per_sample * n,  0};
+		BitstreamIn bout = { got, bits_per_sample * n,  0};
 		int j =0;
-		for (j = 0; j * bits_per_sample < n * 8 && j < sizeof(GraphBuffer); j++) {
+		for (j = 0; j * bits_per_sample < n * 8 && j < n; j++) {
 			uint8_t sample = getByte(bits_per_sample, &bout);
 			GraphBuffer[j] = ((int) sample )- 128;
 		}
@@ -2017,7 +2117,7 @@ int CmdLoad(const char *Cmd)
 int CmdLtrim(const char *Cmd)
 {
 	int ds = atoi(Cmd);
-
+	if (GraphTraceLen<=0) return 0;
 	for (int i = ds; i < GraphTraceLen; ++i)
 		GraphBuffer[i-ds] = GraphBuffer[i];
 	GraphTraceLen -= ds;
@@ -2165,18 +2265,114 @@ int CmdZerocrossings(const char *Cmd)
 	return 0;
 }
 
+int usage_data_bin2hex(){
+		PrintAndLog("Usage: data bin2hex <binary_digits>");
+		PrintAndLog("       This function will ignore all characters not 1 or 0 (but stop reading on whitespace)");
+		return 0;
+}
+
+/**
+ * @brief Utility for conversion via cmdline.
+ * @param Cmd
+ * @return
+ */
+int Cmdbin2hex(const char *Cmd)
+{
+	int bg =0, en =0;
+	if(param_getptr(Cmd, &bg, &en, 0))
+	{
+		return usage_data_bin2hex();
+	}
+	//Number of digits supplied as argument
+	size_t length = en  - bg +1;
+	size_t bytelen = (length+7) / 8;
+	uint8_t* arr = (uint8_t *) malloc(bytelen);
+	memset(arr, 0, bytelen);
+	BitstreamOut bout = { arr, 0, 0 };
+
+	for(; bg <= en ;bg++)
+	{
+		char c = Cmd[bg];
+		if( c == '1')	pushBit(&bout, 1);
+		else if( c == '0')	pushBit(&bout, 0);
+		else PrintAndLog("Ignoring '%c'", c);
+	}
+
+	if(bout.numbits % 8 != 0)
+	{
+		printf("[padded with %d zeroes]\n", 8-(bout.numbits % 8));
+	}
+
+	//Uses printf instead of PrintAndLog since the latter
+	// adds linebreaks to each printout - this way was more convenient since we don't have to
+	// allocate a string and write to that first...
+	for(size_t x = 0; x  < bytelen ; x++)
+	{
+		printf("%02X", arr[x]);
+	}
+	printf("\n");
+	free(arr);
+	return 0;
+}
+
+int usage_data_hex2bin(){
+
+	PrintAndLog("Usage: data bin2hex <binary_digits>");
+	PrintAndLog("       This function will ignore all non-hexadecimal characters (but stop reading on whitespace)");
+	return 0;
+
+}
+
+int Cmdhex2bin(const char *Cmd)
+{
+	int bg =0, en =0;
+	if(param_getptr(Cmd, &bg, &en, 0))
+	{
+		return usage_data_hex2bin();
+	}
+
+
+	while(bg <= en )
+	{
+		char x = Cmd[bg++];
+		// capitalize
+		if (x >= 'a' && x <= 'f')
+			x -= 32;
+		// convert to numeric value
+		if (x >= '0' && x <= '9')
+			x -= '0';
+		else if (x >= 'A' && x <= 'F')
+			x -= 'A' - 10;
+		else
+			continue;
+
+		//Uses printf instead of PrintAndLog since the latter
+		// adds linebreaks to each printout - this way was more convenient since we don't have to
+		// allocate a string and write to that first...
+
+		for(int i= 0 ; i < 4 ; ++i)
+			printf("%d",(x >> (3 - i)) & 1);
+	}
+	printf("\n");
+
+	return 0;
+}
+
 static command_t CommandTable[] =
 {
 	{"help",            CmdHelp,            1, "This help"},
-	{"askedgedetect",   CmdAskEdgeDetect,   1, "[threshold] Adjust Graph for manual ask demod using length of sample differences to detect the edge of a wave (default = 25)"},
+	{"askedgedetect",   CmdAskEdgeDetect,   1, "[threshold] Adjust Graph for manual ask demod using the length of sample differences to detect the edge of a wave (use 20-45, def:25)"},
 	{"askem410xdemod",  CmdAskEM410xDemod,  1, "[clock] [invert<0|1>] [maxErr] -- Demodulate an EM410x tag from GraphBuffer (args optional)"},
 	{"askgproxiidemod", CmdG_Prox_II_Demod, 1, "Demodulate a G Prox II tag from GraphBuffer"},
+	{"askvikingdemod",  CmdVikingDemod,     1, "Demodulate a Viking tag from GraphBuffer"},
 	{"autocorr",        CmdAutoCorr,        1, "[window length] [g] -- Autocorrelation over window - g to save back to GraphBuffer (overwrite)"},
-	{"biphaserawdecode",CmdBiphaseDecodeRaw,1,"[offset] [invert<0|1>] Biphase decode bin stream in DemodBuffer (offset = 0|1 bits to shift the decode start)"},
+	{"biphaserawdecode",CmdBiphaseDecodeRaw,1, "[offset] [invert<0|1>] [maxErr] -- Biphase decode bin stream in DemodBuffer (offset = 0|1 bits to shift the decode start)"},
+	{"bin2hex",         Cmdbin2hex,         1, "bin2hex <digits>     -- Converts binary to hexadecimal"},
 	{"bitsamples",      CmdBitsamples,      0, "Get raw samples as bitstring"},
 	{"buffclear",       CmdBuffClear,       1, "Clear sample buffer and graph window"},
 	{"dec",             CmdDec,             1, "Decimate samples"},
 	{"detectclock",     CmdDetectClockRate, 1, "[modulation] Detect clock rate of wave in GraphBuffer (options: 'a','f','n','p' for ask, fsk, nrz, psk respectively)"},
+	{"fdxbdemod",       CmdFDXBdemodBI    , 1, "Demodulate a FDX-B ISO11784/85 Biphase tag from GraphBuffer"},
 	{"fskawiddemod",    CmdFSKdemodAWID,    1, "Demodulate an AWID FSK tag from GraphBuffer"},
 	//{"fskfcdetect",   CmdFSKfcDetect,     1, "Try to detect the Field Clock of an FSK wave"},
 	{"fskhiddemod",     CmdFSKdemodHID,     1, "Demodulate a HID FSK tag from GraphBuffer"},
@@ -2186,21 +2382,23 @@ static command_t CommandTable[] =
 	{"getbitstream",    CmdGetBitStream,    1, "Convert GraphBuffer's >=1 values to 1 and <1 to 0"},
 	{"grid",            CmdGrid,            1, "<x> <y> -- overlay grid on graph window, use zero value to turn off either"},
 	{"hexsamples",      CmdHexsamples,      0, "<bytes> [<offset>] -- Dump big buffer as hex bytes"},
+	{"hex2bin",         Cmdhex2bin,         1, "hex2bin <hexadecimal> -- Converts hexadecimal to binary"},
 	{"hide",            CmdHide,            1, "Hide graph window"},
 	{"hpf",             CmdHpf,             1, "Remove DC offset from trace"},
 	{"load",            CmdLoad,            1, "<filename> -- Load trace (to graph window"},
 	{"ltrim",           CmdLtrim,           1, "<samples> -- Trim samples from left of trace"},
 	{"rtrim",           CmdRtrim,           1, "<location to end trace> -- Trim samples from right of trace"},
-	{"manrawdecode",    Cmdmandecoderaw,    1, "Manchester decode binary stream in DemodBuffer"},
+	{"manrawdecode",    Cmdmandecoderaw,    1, "[invert] [maxErr] -- Manchester decode binary stream in DemodBuffer"},
 	{"norm",            CmdNorm,            1, "Normalize max/min to +/-128"},
 	{"plot",            CmdPlot,            1, "Show graph window (hit 'h' in window for keystroke help)"},
-	{"printdemodbuffer",CmdPrintDemodBuff,  1, "[x] -- print the data in the DemodBuffer - 'x' for hex output"},
+	{"printdemodbuffer",CmdPrintDemodBuff,  1, "[x] [o] <offset> [l] <length> -- print the data in the DemodBuffer - 'x' for hex output"},
 	{"pskindalademod",  CmdIndalaDecode,    1, "[clock] [invert<0|1>] -- Demodulate an indala tag (PSK1) from GraphBuffer (args optional)"},
+	{"psknexwatchdemod",CmdPSKNexWatch,     1, "Demodulate a NexWatch tag (nexkey, quadrakey) (PSK1) from GraphBuffer"},
 	{"rawdemod",        CmdRawDemod,        1, "[modulation] ... <options> -see help (h option) -- Demodulate the data in the GraphBuffer and output binary"},  
 	{"samples",         CmdSamples,         0, "[512 - 40000] -- Get raw samples for graph window (GraphBuffer)"},
 	{"save",            CmdSave,            1, "<filename> -- Save trace (from graph window)"},
 	{"scale",           CmdScale,           1, "<int> -- Set cursor display scale"},
-	{"setdebugmode",    CmdSetDebugMode,    1, "<0|1> -- Turn on or off Debugging Mode for demods"},
+	{"setdebugmode",    CmdSetDebugMode,    1, "<0|1|2> -- Turn on or off Debugging Level for lf demods"},
 	{"shiftgraphzero",  CmdGraphShiftZero,  1, "<shift> -- Shift 0 for Graphed wave + or - shift value"},
 	{"dirthreshold",    CmdDirectionalThreshold,   1, "<thres up> <thres down> -- Max rising higher up-thres/ Min falling lower down-thres, keep rest as prev."},
 	{"tune",            CmdTuneSamples,     0, "Get hw tune samples for graph window"},